Preferred Formation of Minority Concomitant Polymorphs in 2D Self‐Assembly under Lateral Nanoconfinement

Control over polymorph formation in the crystallization of organic molecules remains a huge scientific challenge. Now, preferential formation is presented of one polymorph, formed by chiral molecules, in controlled two‐dimensional (2D) nanoconfinement conditions at a liquid–solid interface. So‐calle...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2019-09, Vol.58 (37), p.12964-12968
Main Authors: Seibel, Johannes, Amabilino, David B., De Feyter, Steven
Format: Article
Language:English
Subjects:
2D crystallization
Crystallization
Liquid-solid interfaces
nanoconfinement
Organic chemistry
polymorphism
Pyrolytic graphite
scanning tunneling microscopy
supramolecular chemistry
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Summary:Control over polymorph formation in the crystallization of organic molecules remains a huge scientific challenge. Now, preferential formation is presented of one polymorph, formed by chiral molecules, in controlled two‐dimensional (2D) nanoconfinement conditions at a liquid–solid interface. So‐called nanocorrals to control concomitant polymorph formation were created in situ via a nanoshaving protocol at the interface between 1‐phenyloctane and covalently modified highly‐oriented pyrolytic graphite (HOPG). The preferentially formed polymorphs, which were less stable in the large‐scale monolayers, could be selected simply by varying the orientation of the square nanocorrals with respect to the HOPG lattice. Nanocorrals created in situ can selectively induce the formation of one of two concomitant polymorphs, which otherwise appear simultaneously at the interface of 1‐phenyloctane/highly‐oriented pyrolytic graphite.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201908552